I accidentally discarded the two Aqua Mira caps that I use to mix the drops. I'm not ready to buy a new set of Aqua Mira, besides that would only get me one cap and I'm really used to two now. What's the best alternative?

If I have to, I can just use Platy caps (or Coke caps), but they have threads and ridges in them that might make emtpying 14 drops (or 22 when using my BPL mini-droppers) a little tricky.

I use the 0.25 oz Mini Vials sold on this site to mix my Aqua Mira. I also place the Part A and Part B into their own mini dropper too. This way when I do a 3L bladder it is easier to mix all at once and pour into the bladder when time has been reached.